The biaxial compression mechanical properties of crushed rock |
| |
Authors: | PengCheng Wang JianKun Liu and Li Liu |
| |
Institution: | School of Civil Engineering of Beijing Jiaotong University, Beijing 100044, China;School of Civil Engineering of Beijing Jiaotong University, Beijing 100044, China;School of Civil Engineering of Beijing Jiaotong University, Beijing 100044, China |
| |
Abstract: | Crushed rock subgrade, as one of the roadbed-cooling methods, has been widely used in the Qinghai-Tibet Railway. Much
attention has been paid on the cooling effect of crushed rock; however, the mechanical properties of crushed rock are
somehow neglected. Based on the discrete element method, biaxial compression test condition for crushed rock is compiled
in FISH language in PFC2D, and the natural shape of crushed rock is simulated with super particle "cluster". The effect
of particle size, crushed rock strength and confining pressure level on overall mechanical properties of the crushed
rock aggregate are respectively analyzed. Results show that crushed rock of large particle size plays an essential framework
role, which is mainly responsible for the deformation of crushed rock aggregate. The strength of gravel has a great
influence on overall mechanical properties which means that strength attenuation caused by the freeze thaw cycles cannot
be ignored. The stress-strain curves can be divided into two stages including shear contraction and shear expansion at
different confining pressures. |
| |
Keywords: | crushed rock subgrade discrete element method particle flow code mechanical property biaxial compression |
本文献已被 CNKI 等数据库收录! |
| 点击此处可从《寒旱区科学》浏览原始摘要信息 |
| 点击此处可从《寒旱区科学》下载免费的PDF全文 |
|